Lens-frame measuring and expanding device



' 1,615,601 Jan' 25 1927' J. R. VAN TAssl-:L

LENS FRAME MEASURING AND EXPANDING DEVICE Filed March 8, 1921 .Errea/vsn faces of the loar nl,

rlhe thickness et these plates corresponds approximately to the thickness et an ordinary lens and the edges thereof are beveled at 1G- to correspond to the beveled edges ot the lens when grounf` to 'Fit in the. rims,

which latter are irovided with the usual inner peripheral grooves to receive these beveled edges of the lenses and to retain them in operative position in said f ame f The combined width of the plate-sections lengthwise ot the bar --lis somewhat less than the longer axis ot the rim or trame to be measured so as to allow said plate-sections to readily enter the opening, in the trame, the same being` also true of the plate-sections Mllwith reference to their adaptation to the measurement of circular rims or trames.

The plates --10- and -llare held in slightly spaced relation to the adjacent bars -l and 2 by means of washers 1G- so as to enable the grooves in the frame to be easily registered with the ribs on the edges ot the plates without excessive interference with the adjacent surfaces of the bars *land -2-.

The opposite yfaces ot one of the bars as -lare provided with graduations or scales -17- and -18- preferably millimeters calibrated to correspond to standard sizes or master patterns to determine or indicate the size oi the trame or rim under test tor relative accuracy as compared with a standard or master pattern, and may also be used to indicate the relative accuracy or inaccurzuiy ot the two trames or rims of an eye-glass or spectacle mounting.

lt will now be understood that the crossbar -3- is secured to one end of the bars -2- and that the inner plate-sections 10- and llare secured to the same bars a short distance from the other end thereof, the outer plate-sections 10- and l1- being,Y secured to the adjacent end ot the bar -l-, which in turn is extended through and some distance beyond the crossbar -3- for receiving' the spring T- and hfand-piece 6 and permitting relative endwise movement of the bar im and hars -2-w tor opening or separating the plates ot each pair a suiiicient distance to make the desired measurement of the frame or rims under test, after which the hand pressure upon the cross-har -3- and handpiece MG may be released to allow the parts to be retracted to their normal positions by the spring -7-.

ln the operation of this device, the trame or rim to be tested is placed by hand around the set of plates -10- or --llaccording;v to the 'torni oi the lens under test while the plates are in their retracted positions, the groove in the trame beingl registered with the beveled peripheral edge oi one of the plates, whereupon the movement et' the crossbar 3- and plunger-head -G- toward cach other will open the sections against opposite sides of the rim or frame, which serves as the limiting stop to limit said opening` movement, at which time, the size of the iframe will be indicated by the corresponding scales 17- or -l8-- This operation may be repeated for both frames of lensmounting` to determine the relative sizes ot the lens-trame, although it is evident that the same device may be used for testing any other ring or open frame either circular or elliptical within the range of either set et plates.

It is also evident that other means may be employed tor opening and closing the ditterent sets of plates without departing from the spirit of this invention.

l/Vhat l claim is:

A device 'for expanding and measuring the rims of lenses comprising a pair-ot bars arranged in parallel spaced relation, a cross bar connecting' said bars near one end and extending laterally beyond opposite sides thereof to torni handles, said cross bar having a guide opening' therethrough registering with the space between the bars, rim-engaging plates secured to opposite faces of said bars, a separate har slidable lengthwise of and between the first-named bars and between said plates and extendingthrough the opening in the cross har, a handle on one end of the separate bar, and rim-engaging plates secured to opposite faces et the other end of the separate bar to cooperate with the firstnamed plates. l

In witness whereof have hereunto set .my hand this 3d day of March, 1921.

JOHN lt. VAN TASSEL. 

